During the unfolding of the Webster event, a second house caught on fire, but due to the gunfire, firefighters could not respond to that fire.

Later, CNN reported at 10 am Eastern:

At least two firefighters were fatally shot and two wounded after arriving to battle a blaze at a house in upstate New York today, police in Webster, New York, told reporters.

Authorities believe someone shot at the firefighters shortly after they exited their vehicles, said Rob Boutillier, fire marshal in the town of Webster, New York.

For hours, the gunfire stopped firefighters from working to extinguish the flames and forced police SWAT teams to evacuate homes in the area.

Several people have been shot at the scene of a fire on Lake Road in Webster [New York]. The fire is at 191 Lake Road near Bay Road. A source tells 13WHAM News that at that scene, an unknown gunman opened fire on fire crews on the scene. ~ Source.

NBC News tweets that "Suspect responsible for shooting 4 firefighters, 2 fatally, in Webster, New York, was found dead at scene."

WTHI - TV reported, in part,

The West Webster Fire District learned of the fire early Monday after a report of a car and house on fire on Lake Road, on a narrow peninsula where Irondequoit Bay meets Lake Ontario, Monroe County Sheriff Patrick O'Flynn said. The fire appeared from a distance as a pulsating ball of flame glowing against the early morning sky, flames licking into treetops and reflecting on the water, with huge bursts of smoke billowing away in a brisk wind.

Two of the firefighters arrived on a fire engine and two in their own vehicles, Pickering said. After the gunman fired, one of the wounded men managed to flee, but the other three couldn't because of flying gunfire.

A police armored vehicle was used to recover two of the men, and eventually it evacuated 33 people from nearby homes, the police chief said.

The dead men were identified as Police Lt. Michael Chiapperini, 43, the Webster Police Department's public information officer; and Tomasz Kaczowka, also a 911 dispatcher, whose age was not released.

Pickering described Chiapperini as a "lifetime firefighter" with nearly 20 years with the department, and called Kaczowka a "tremendous young man."Source.

Police in New York state say a man who ambushed firefighters had served 17 years for manslaughter in the death of his grandmother.Webster Police Chief Gerald Pickering says 62-year-old William Spengler was found dead of a self-inflicted gunshot to the head.Police say he set fire to a car and house to lure firefighters to his house...

On Christmas Day, CNN News released this bulletin:

The shooter who ambushed and killed two upstate New York firefighters Monday left a note behind indicating his intentions, police said today. "I still have to get ready to see how much of the neighborhood I can burn down and do what I like doing best -- killing people," the three-page typewritten note said.Two other firefighters who were wounded in the ambush are in stable condition after surgery, police say.The gunman, William Spengler, 62, was convicted decades ago of killing his grandmother. He was found dead of a self-inflicted gunshot wound hours after the firefighters were shot.